Megadeth usually plays about 16-18 songs. About a third of their set list is different from Gigantour and/or from their new album (unreleased at the time of Gigantour 2006). That's exactly the kind of set list calculus you'd expect from a band like Megadeth.

__________________
Jaco died for our sins so that modern bass players could be free to play more and be heard.